With the DLT 7000's our data transfer rates are awful, less than 5MB/sec.  A
tape mount request until read time can be as long as 8 minutes with the
DLTs.

Regards,
Jeannine Walter

Purina Mills, Inc.
St. Louis, MO
314-768-4181
Jeannine_Walter AT Purina-Mills DOT com <mailto:Jeannine_Walter AT Purina-Mills 
DOT com>


        -----Original Message-----
        From:   Kelly Lipp [SMTP:lipp AT STORSOL DOT COM]
        Sent:   Thursday, March 02, 2000 4:47 PM
        To:     ADSM-L AT VM.MARIST DOT EDU
        Subject:        Re: New library and sharing

        And I would think that you probably won't see any real performance
gain by
        moving from SCSI to Fiber due to the bottleneck really being at the
drive
        level.

        What sorts of data transfer rates are you seeing?  I'd like to know
GB/hour
        and also some tape mount times.

        Thanks,

        Kelly J. Lipp
        Storage Solutions Specialists, Inc.
        PO Box 51313
        Colorado Springs CO 80919
        (719)531-5926
        Fax: (719)260-5991
        www.storsol.com
        lipp AT storsol DOT com

        -----Original Message-----
        From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On 
Behalf
Of
        Clint Placette
        Sent: Thursday, March 02, 2000 1:06 PM
        To: ADSM-L AT VM.MARIST DOT EDU
        Subject: Re: New library and sharing


        Here's my two cents.  I have 4 9840 (SCSI) on separate  two SCSI
buses in a
        9740
        Library.  I have not had a problem with this configuration.  These
drives
        are
        fast.  If I had a choice I would go with the FC 9840 drives.  I have
a
        couple of
        point to point SANs and I plan on building a switch fabric SAN in as
soon as
        I
        can get it approved.  The advantage the FC 9840s have is you can
connect
        directly to a SAN environment.  With the SCSI devices you will need
a bridge
        (latency lost).  But the main reason is speed at minimum you will
get close
        to
        100Mb transfer rate on a SAN.  You will never come close of getting
that on
        a
        SCSI bus even if it was connect to a SAN.  And LANless backups will
knock
        you
        backup/restore window down.  Since haven't seen the specs. on the FC
9840s I
        would think the bottle neck would be on the transfer rate at the
tape level
        (just a guess)